Drinking cup



FIG. 1 is a top and side perspective view of a drinking cup showing my new design having octagonal rotational symmetry about a vertical axis;

FIG. 2 is a front elevational view where the position of the interior portion is on the flat side, all seven other views showing a flat side are the same;

FIG. 3 is a right side elevational view where the interior portion is also on a flat side, all seven other views showing a flat side are the same;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

I claim the ornamental design for a drinking cup, as shown and described. 